Audio-GD Master 2A

The M2A mono pure Class-A power amplifiers are designed without any compromises using the best components available on the market! The analogue amplifier stages of this amplifier are non-feedback and DC coupled without any opamps, all discrete. The power supplies of this amplifier are feeded by 4 transformers, 2 per channel and RCORE for pre-staging amplification. Audio-GD uses a technique that is unique in this price range, and designed using "Diamond Cross output stages". 

The Master 2A has special “Linear Fidelity” technology designed output stages . The output stages are designed without negative feedback but can keep the distortion very low and has an excellent ultra linear performance. On many power amp designs the output power determines the amount of distortion. Even when measuring a specific output power, the distortion level of the full frequency band already has a significant difference.

The blue line shows a frequency at 8 ohm 20W output of a well known power amplifier of round USD10k.

Different types of distortion also affect the sound. For example, if you are playing a piano, you can hear the difference between a brand A piano or a brand B piano due to the different distortion on the frequency band. The more lifelike the rendering, so the better this distortion remains intact, the better you can perceive the differences between the A and B brands.

The applied negative feedback is done to reduce the distortion of an amplifier. A disadvantage of an amplifier with negative feedback is that it reduces distortion but also makes listening unpleasant. Also, the negative feedback power amplifier often has a good distortion result when measured with an ideal emulation load, but with real speakers, the electrical potential from the speaker through the feedback loop to the amplifier’s input stages can actually cause greater distortion.

The negative feedback power amp reduces the distortion, but the distortion increases as the output power increases, making the larger dynamic music sound loud and fire in your face while listening to the music.

Usually the non-negative feedback design has high distortion and is difficult to control, especially driver output stage operating under strong current condition. In our Master 2A design, the gain stages adopted ACSS technology, it is the design without negative feedback, but the original advantage of the very low distortion remains.